Telephone attachment.



Patented Oct. 2 I902) G. T. NEWMAN. TELEPHONE ATTACHMENT.

(Application filed Sept. 8, 1901;)

3 $heets-Sheet I.

(No Model.)

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Patent-ad not. 28, 1902-.

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(Appl z nflldspt a 1901 a Sheets-shat 2.-

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' No. 712,402. Patented uctzs, 1902.

GQT. NEWMAN. TELEPHONE ATTACHMENT.

[Application filed Sept. 6, 1901.)

3 Sheets-Sheet 3.

(Kilo Model.)

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atto'amqo Wihwaoao To all whom it may concern: 1

UNITED STATES.

PATENT OFFICE.

[GEORGE T. NEWMAN, or BONjAP ARTE, IOWA.

. TELE PH AZTTACHM EN-1'."

SPECIFICATION formingpart of Letters Patent No. 712,402, dated October 28, 1902. 1 Application filed September 6.4901. s rain). 74,526. on model.)

. Be it known that I, GEORGE '1. NEWMAN, a

citizen of the United States, residing at Bona I parte, in the county of Van Enron and State of Iowa, have invented certain new and useful Improvements in Telephone Attachments,

,of which the following is a specification, refimprovements in telephones; and its primary object is to providea switch attachment of novel construction whereby an ordinary telephone connected therewith may be switched into or out of circuit with either a private or party line.

A furtherobject ously into either of the two circuits, respectively.

With these and other objects in view the invention consists in the novel construction and combination of parts hereinafter more fully described and claimed,and illustrated in the accompanying drawings, showing the preferred form of my invention, and in which-- Figure 1 is a perspective view of the attachment opened, showing the interior thereof. Fig. 2 is a front elevation. Fig. 3 is a rear elevation. Fig. 4 is a transverse section through the device. Fig. 5 is an elevation of the inner face of the front of the attachment with the switch removed. Fig.6 is a detail view of the switch, and Fig. 7 is a diagram matical view showing the attachment used in 1 connection with'a private and a party line.

Referring to the figures by numerals of ref-- erence, 1 is a preferably wooden base having abox2 secured thereon in anysuitable manner, a door 3 being hinged,,thereto. Secured to the base, at the lower edge thereof, are six posts 4 4,5 5, and 6 6. The wires of the private line are secured to the posts 4 4, the party-line wires to the, posts 6 6, and posts 5 5 are connected, by means of wires 7 7,. to the telephone 8. Three pairs of contact-plates 9, 10, and 11 are secured to the inner face of the wall of the box to which the door 3 is hinged. These plates are arranged one above the other, and the upper pair is connected, by means of wires 12, with posts 4, the lower pair by means is to provide the attachment With a signal-bell, said bell" and tele-- phone being adapted to be thrown simultane .ofwires13 with posts 5, and [hp intermediate pair 10 are connected by wires 14 with the,

posts 6. 1

Formed withinthe inner face of thedoor 3, near the centerof the lowerend thereof, is a recess 15, within which are secured two pairs of oppositely-disposed spring-strips 16 and 17, respectively. The upper pair of springs 16 are connected, by means ofwires 18, with the magnet 19 of the signal-bell 20. A lever 21 is journaled upon ablock of insulating material 22, secured to the door 3, adjacent to .the lower edge of recess. Pivoted to the inner end of this lever is a sliding block 23, of insulating material, to the inner surface of which are secured'four parallel metal strips 24, which extend over the recess 15 and each of which is adapted to contact at all times with one of the springs 1617.

Ateach side of the recess 15 and in alinement with each strip 24 is a contact-plate 25. The two upper and two lower plates 25 on the left-hand side of recess 15, Figs. 1 and 5, are connected by wires 26 26 and 27 27 to the two lower and two upper plates, respectively, upon the opposite side. Three pairs of angular spring-arms 28, are secured to the inner edge of the door 3 and are adapted when said door is closed to contact with the plates 9, 10, andll. The upper pair of arms is connected, by means of wires 29, with the upper left-hand plates 25 and the intermediate pair by means of wires 30 with the lower left-hand plates 25. The lower arms 28 are secured to wires 31, which are connected to the lower springs 17 within recess 15.

The door 3 is adapted to be held in closed position by a suitable lock 32, and the lever 21 extends down through a recess 33 in the bottom of the box to a point where it maybe readily grasped by the operator.

The strips 24 are always in contact with the plates 25 upon one side of the recess 15. When the lever is moved to the right, Fig. 2, the switch will assume the position shown in Fig. 1. The electric current then passes through wires 12 and 29 via plates 9 and 28 and thence through wires 26 and their plates 25 into the lower strips 24. As these'strips contact with the lower springs 17 the current will pass therethrough through wires 31 and 13 and into the telephone 8 via wires 7. The

telephone is thus in circuit with the privateline. At' the same time the current from the party-line passes through wires 14, 30, and 27 and into the upper strips 24, thence through springs 16 and-wires 18 to the bell-magnet. It is obvious that by reversing the switch the party-line is placed in circuit with the tele-,

' phone and the private line incircuit with the i which is out of circuit with the telephone.

From the foregoing description it will be seen that two telephones upon the same or separate party-lines can be connected by a private line, calls can be received simultaneously over both lines, and conversation can be carried on over the private line without the necessity of calling up central.

In the foregoing description I have shown the preferred form of my invention; but I do not limit myself thereto, as I am aware that modifications may be made therein without departing from the spirit or sacrificing the advantages thereof, and I therefore reserve the right to make such changes as fairly fall within the scope of my invention.

Having thus fully described my invention, what I therefore 'claim as new, and desire to secure by Letters Patent, is-

1. Aswitch attachment for telephones comprising a box, an alarm-bell thereon, springs electrically connected with the magnet of the bell, a slide, conductor-strips thereon normally contacting with thesprings,a telephone, springs adapted to be connected electrically therewith, conductor-strips upon the slide normally contacting with said springs, contact-plates on opposite sides of the slide and in the paths of the strips, independent telephone-circuits, said plates being adapted to be electrically connected with the telephone- I 2. A switch attachment for telephones com-- prising a box, an alarm-bell thereon, springs electrically connected with the magnet of the bell, contact-plates at opposite sides of said springs and adapted to be connected with two independenttelephone-circuits respectively, a telephone, springs electrically connected therewith, contact-plates at opposite sides thereof and adapted to be connected with said two independent telephone-circuits respectively, a slide between the plates, conductorstrips thereon contacting with the springs and adapted to be shifted into contact with the plates upon either side, and electrical connections between the contact-plates whereby, when the slide is shifted in one direction, the bell is placed in one circuit and the telephone in the remaining telephone-circuit, and when the slide is reversed the bell and telephone are placed in the opposite circuits.

3. In atelephone attachmentof the character described, a switch comprising a slide, an operating-lever pivoted at one end to the slide, parallel conductor-strips secured to,and insulated from each other, by the slide, a contact electrically connected with each strip, and a series of contacts adjacent to the opposite ends of the strips, the contacts of either series being adapted to be placed simultaneously in circuit with their respective strips on the slide.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE T. NEWMAN.

Witnesses:

G. E. FAHR, W. E. SMrrH. 

